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ICS844031I-01 Datasheet Preview

ICS844031I-01 Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844031I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844031I-01 is an Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS844031I-01 uses an 18pF parallel resonant
crystal over the range of 19.6MHz - 27.2MHz. For
Ethernet applications, a 25MHz crystal is used to generate
312.5MHz. The ICS844031I-01 has excellent <1ps phase jitter
performance, over the 1.875MHz - 20MHz integration range.
The ICS844031I-01 is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
FEATURES
(1) Differential LVDS output
Crystal oscillator interface, 18pF parallel resonant crystal
(19.6MHz - 27.2MHz)
Output frequency range: 245MHz - 340MHz
VCO range: 490MHz - 680MHz
RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.49ps (typical)
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
COMMON CONFIGURATION TABLE
Inputs
Crystal Frequency (MHz) M
25 25
Output Frequency
N
Multiplication
Value M/N
(MHz)
2 12.5
312.5
BLOCK DIAGRAM
OE Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
N = ÷2 (fixed)
M = ÷25 (fixed)
Q
nQ
PIN ASSIGNMENT
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 OE
ICS844031I-01
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
844031AGI-01
www.icst.com/products/hiperclocks.html
REV. B JULY 6, 2005
1




ICS

ICS844031I-01 Datasheet Preview

ICS844031I-01 Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844031I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VDDA
Power
Analog supply pin.
2
GND
Power
Power supply ground.
3, 4 XTAL_OUT, XTAL_IN Input
5 OE Input
Pullup
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Output enable pin. When HIGH, Q0/nQ0 output is active.
When LOW, the Q0/nQ0 output is in a high impedance state.
LVCMOS/LVTTL interface levels.
6, 7
nQ, Q
Output
Differential clock outputs. LVDS interface levels.
8
VDD Power
Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
844031AGI-01
www.icst.com/products/hiperclocks.html
2
REV. B JULY 6, 2005


Part Number ICS844031I-01
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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